JPS5881536A - Manufacture of pulley for electromagnetic connecting device - Google Patents

Abstract

PURPOSE:To improve yield and shorten working time in manufacture of a pulley for electromagnetic connecting device by providing a projection in axial direction and bending the projection in radial direction. CONSTITUTION:A cylindrical body having a through hole 21 at the center is formed. Then, an axial part 27, a base plate part 28 and a cylindrical part 29 are formed by cold forging. Each part is finished and an axial part 22, a base plate part 23 and a cylindrical part 25 are formed. At the same time, inner periphery of an end of the cylindrical part 25 is cut to provided a stepped part 25a, and a projection 25b is formed in axial direction. Next, the projection 25b in axial direction is bent by press woking radially and outward. Thus, a projection 24c is formed to obtain a finished product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a pulley for an electromagnetic coupling device, for example, a goo formed integrally on the outer circumference of a rotor of the electromagnetic coupling device.

2. Description of the Related Art Conventionally, there is a boob integrated with a rotor of an electromagnetic coupling device as shown in FIG. In the figure, (lO
) is a rotating shaft, (10a) is a parallel bottle attached to this rotating shaft (10), (11) is a through hole formed in the shaft portion (12) and through which the rotating shaft (10) passes, and (lla) is a through hole. This is a groove provided in the wall surface of this through hole (11) in the axial direction so as to engage with the parallel bottle (IUa), and this groove (ll
a) and the shaft portion (12) by the parallel bottle (10a).
is fitted with the rotation @ (10) for 6T of sliding only in the axial direction.

(13) is a base plate that protrudes radially from one axial end of the shaft (12), and (13a) is formed around the entire circumference of the base plate (13) in order to provide a lining (not shown) on the outer surface of the base plate (13). (1'3b) is a through window portion formed to face the recess (13a) with supporting portions left at several locations around the circumference, and (14) is an annular recess formed on the outer periphery of the substrate portion (13). A cylindrical body protruding in the direction (14a)ll″j: This cylindrical body (1
4) is formed on the outer periphery of (141)) and is formed on both axial ends of the pulley surface (14a) of the cigarette so as to protrude radially outward over the entire circumference, and is wound around the pulley surface (14a). These are protrusions on both ends of the pulley to prevent wires, etc. from falling off.

The rotor configured in this manner has a coil (not shown) disposed inside the annular space between the shaft (12) and the cylindrical body (14), and the lining faces an armature (not shown) of the rotating body. The magnetic flux generated when the coil is excited is transmitted to the shaft portion (12) and the nodal body (14).
) is applied to the armature through the rotor, and the rotor is attracted by the armature due to the suction force generated at this time.
4a) The linear motion is made via the wire wound around the wire. Incidentally, the window portion (13b) is formed as a magnetic flux short-circuit preventive structure in order to guide the magnetic flux to the armature.

Conventionally, there is a certain forging method as one of the forging methods for manufacturing pulleys for this type of electromagnetic coupling device.The conventional forging method will be described below with reference to FIGS. 2 to 4.

First, in the first step, a metal bar is cut into a fixed length having the capacity required for the finished product to form a cylindrical material (15) as shown in FIG. In the second step, as shown in FIG. 3, a through hole (11) is formed in the material (15). In the third step, as shown in FIG. 4, the shaft part (17), the base plate part (18), and the cylindrical part (19
) to form. This cylindrical part (19) has a thickness in the radial direction that is greater than the pulley end protrusion part (14b) of the finished product (see Figure 1), and the cylindrical body (14) of the finished product (see Figure 1). Tanimae gold motsu which is much larger than that. At the fourth stopper,
Along with finishing each part, the outer periphery of the cylindrical part (19) is cut, and the pulley surface (14a) and the protruding parts (1) at both ends of the pulley surface are cut.
41)) is folded into a shape to form a finished product as shown in Figure 1.

As mentioned above, in the conventional manufacturing method, the outer periphery of the cylindrical part (9) is cut to form the protruding parts (14b) at both ends of the pulley, resulting in large material loss, poor yield, and a large amount of processing time. There was a drawback.

The purpose of the present invention is to provide a method for manufacturing a pulley for an electromagnetic coupling device, which can eliminate the above-mentioned conventional drawbacks, improve the yield, and shorten the processing time. An embodiment will be described based on the drawings. In the first and second steps, the entire cylindrical body having a through hole (21) in the center is formed in the same manner as in the conventional example.

In the third step, as shown in FIG. 5, the shaft portion (27), the base plate portion (28), and the cylindrical portion (29) are formed by cold forging. The protrusion (29a) at one end of the pulley surface is also approximately the same thickness as the protrusion (24b) (see Fig. 7) in the completed product. Since it is formed into a precise size and shape, fewer cutting parts are required during the finishing process in the fourth step, material pt loss is also small, and processing time can be shortened. In the fourth step, as shown in FIG. 6, the troughs are finished and L-shaped, and the shaft portion (22), the substrate portion (23), and the cylindrical portion (25) are formed, as well as one end of the cylindrical portion (25). A step (25a) is formed by cutting the inner circumferential portion of the inner circumferential portion, and a protruding portion (251:+) is formed in the axial direction. In the fifth step, the axial protrusion (251)) is bent radially outward to form a protrusion (24C) by press working, resulting in a completed product as shown in FIG. In addition (23
a) is an annular recess, (23b) is a Vi window, (24) is a joint, (24a) is a protrusion formed by cold forging, (24Q) is an axial direction It is a protrusion that is formed and then bent.

In the above embodiments, the protrusion at the opening end of the cylindrical body is formed in the axial direction and then bent in the radial direction. The protrusion on the other end side or the protrusion parts on both ends may be bent.

Other embodiments of the present invention will now be described with reference to the drawings. Note that in the embodiments shown below, the first and second steps are the same as in the above embodiments, so their explanations will be omitted. 8th
The figure shows a protrusion at one end of the pulley surface of the base plate part formed in the axial direction and then bent in the radial direction. In the third step, as shown in FIG. 8(a), details (27),
A substrate portion (28) and a cylindrical portion (29) are formed, and the cylindrical portion (29) is formed to have approximately the same thickness as the knot-shaped body (24) (see FIG. 8(C)), and the pulley surface. One end protrusion (29a) also completed 1] Protrusion at L1 (241))
(See FIG. 8(C)). In the fourth step, as shown in FIG. 8('D), each part is finished, and one end of the cylindrical part on the substrate side is cut, a stepped part (25a) is formed, and a protruding part (25/b) is formed in the axial direction.
) to form. In the fifth step, the axial protrusion (
25+)) is bent radially outward to form a protrusion (24Q) by press working, resulting in a complete product as shown in Figure 8.

FIG. 9 shows a structure in which the pulley surface protrusions on both sides are formed in the axial direction and then bent in the radial direction. In this case as well, the manufacturing method is almost the same as in the above embodiment, but in the third step, as shown in FIG. 9(a) VC, the radially outward protruding portion it j is not formed. In the fourth step, as shown in Fig. 9(b), both ends of the cylinder, ;fi, are cut to form a stepped part (25a) and a protruding part (25L) in the axial direction.
To run away. In the fifth step, the axial protrusions (25b) formed at both ends of the cylinder 1η≦(25) are bent radially outward by press working to form the protrusions (24C). As described above, according to the method of manufacturing a pulley for an electrical connection device according to the present invention, a protrusion is provided in the axial direction, and then the protrusion is bent in the radial direction. Since this method is used, there are fewer cutting parts and the yield is good. Moreover, the processing time can be shortened.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view showing a pulley integrated with a conventional rotor, and Figs. 2 to 4 are sectional views showing the shape of what is formed in each manufacturing process according to the rice manufacturing method. , FIGS. 5 and 6 are cross-sectional views showing the shapes of the parts formed in each manufacturing process according to one method of implementing the present invention, and FIG. A top view showing the pulley metal and FIGS. 8 and 9 are sectional views showing another method of implementing the present invention. In the figure, (10) is the rotating shaft, (IUa) Vi parallel pin, (]1a) is the groove, (12) and (22) are the shaft, (
13) and (23) are base parts, (14) and (24) are cylindrical bodies, (14a) and (24a) are pulley bends, (F
, sb) are protrusions at both ends of the pulley surface, (24C) are protrusions at one or both ends of the pulley formed by a method of implementing the present invention, (25a) is a stepped portion, and (25b) is an axial protrusion. be. Note that the same reference numerals in each figure indicate the equivalent f41'<minute. Agent Shin Mino - Figure 8 (b) (C) Figure 9 (b) (C)

Claims (1)

[Claims] In a method for manufacturing a pulley for an electromagnetic coupling device, a step is provided on the inner circumference of one or both ends of a cylindrical body having a pulley surface on the outer circumference, and a protrusion with a thick wall is formed in the axial direction. Next, the protrusion is bent radially outward to form one or both of the protrusions at both ends of the pulley surface having a predetermined size and shape.